Having just moved into a new temple, the [young Zen] monk was filled with energy and dedication and surpassed all the other monks in his zeal for cleaning. During work practice, he was an absolute tornado, running throughout the rooms and hallways, sweeping and polishing and dusting everything in sight. One day his teacher asked him, "What are you doing?" The monk beamed a large smile in the direction of his teacher and said, "I am working hard to clear away the dust of delusion, and to reveal the shining face of Buddha which is beneath it." His teacher said to him, "Please don't ever forget. The dust is also the Buddha."

Gary Thorp in Sweeping Changes